CVE-2026-83839: Windows Hyper-V Elevation of Privilege Vulnerability
Time-of-check time-of-use (toctou) race condition in Windows Hyper-V allows an authorized attacker to elevate privileges locally.
Other sources
Windows Hyper-V Elevation of Privilege Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.33650Patch KB5126646 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.28000.3231Patch KB5127646 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26300.9711Patch KB5127648 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.22631.7652Patch KB5126653 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.17763.9376Patch KB5126651 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26200.9711Patch KB5127648 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.19044.7807Patch KB5126657 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.20348.5761Patch KB5126655 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.9711Patch KB5127648
Event History
Frequently Asked Questions
Who can exploit this vulnerability?
Exploitation requires an authorized attacker with local access and low-level privileges on an affected Windows system. It is not described as remotely exploitable and does not require user interaction.
What is the likely impact if exploitation succeeds?
A successful exploit can elevate local privileges and may affect confidentiality, integrity, and availability. The issue is a time-of-check time-of-use race condition in Windows Hyper-V.
Which systems should be assessed?
Assess systems running Microsoft Windows 10, Windows 11, Windows Server 2019, Windows Server 2022, or Windows Server 2025 where Windows Hyper-V is in use.